7
0 29 28 22 15 21 21 
29 0 13 11 16 10 10 
28 13 0 10 17 11 11 
22 11 10 0 13 7 7 
15 16 17 13 0 10 6 
21 10 11 7 10 0 4 
21 10 11 7 6 4 0